Frequency Mod: Difference between revisions

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This block is an input amplitude controlled complex sine.  It outputs a signal, which has a momentary phase increase that is proportional to sensitivity and input amplitude.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
More specifically, takes a real, baseband signal (x_m[n]) and output a frequency modulated signal (y[n]) according to:
 
[[File:freq-mod-1.png|300px]]
 
Where x[n] is the input sample at time n and  is the frequency deviation. Common values for  are 5 kHz for narrowband FM channels such as for voice systems and 75 KHz for wideband FM, like audio broadcast FM stations.  In this block, the input argument is, not the frequency deviation. The sensitivity specifies how much the phase changes based on the new input sample. Given a maximum deviation, and sample rate, the sensitivity is defined as:
 
[[File:freq-mod-2.png|300px]]


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; Sensitivity (''R'')
: Description of parameter, provide any tips or recommended values.  Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: radians/sample = amplitude * sensitivity
 
; Param 2
: blah blah blah


== Example Flowgraph ==
== Example Flowgraph ==

Revision as of 04:38, 21 July 2019

This block is an input amplitude controlled complex sine. It outputs a signal, which has a momentary phase increase that is proportional to sensitivity and input amplitude.

More specifically, takes a real, baseband signal (x_m[n]) and output a frequency modulated signal (y[n]) according to:

Freq-mod-1.png

Where x[n] is the input sample at time n and is the frequency deviation. Common values for are 5 kHz for narrowband FM channels such as for voice systems and 75 KHz for wideband FM, like audio broadcast FM stations. In this block, the input argument is, not the frequency deviation. The sensitivity specifies how much the phase changes based on the new input sample. Given a maximum deviation, and sample rate, the sensitivity is defined as:

Freq-mod-2.png

Parameters

(R): Run-time adjustable

Sensitivity (R)
radians/sample = amplitude * sensitivity

Example Flowgraph

Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.

Source Files

C++ files
TODO
Header files
TODO
Public header files
TODO
Block definition
TODO
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